| 摘要 |
PURPOSE:To increase the degree of freedom of lens design and to realize compact constitution by providing a member which enters the movement track of a member moving associatively with a shutter blade and controls its displacement quantity in its opening direction and a means which sets its position. CONSTITUTION:The pin 39a of a blade driving lever 39 penetrates the long holes of shutter blades 35 and 36 and its tip is locked to a control surface 51a. When an AE cam 26 and the lever 39 begin to rotate counterclockwise, the blades 35 and 36 which are energized by a spring 42 are opened to provide exposure. When a zoom ring 50 rotates corresponding to focal length, the tip 51b of a control arm slides on a cam surface 50a to control the position of the pin 39a abutting on the control surface 51a, and the aperture value of the blade engaged with the pin 39a is set to a proper position. The degree of freedom of lens design increases and the compact, inexpensive constitution is realized.
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